<i>Psychotria caraballoensis</i> (Rubiaceae), a new species from northern Luzon, Philippines

In this paper, we describe and illustrate Psychotria caraballoensis , a new endemic species from the Caraballo Mountain Range, Luzon, Philippines. It is allied to the Subalpina species group sensu Sohmer and Davis (2007), and resembles Psychotria sohotonensis . However, it is distinct by its greater number of lateral veins, leaf blades drying khaki to dark brown, inflorescences/infructescences with axes branching into verticillate or oppositely branched cymules, puberulous flowers with longer corolla lobes, smaller and globose to subglobose fruits, and ruminate endosperms. It is one of few species of Philippine Psychotria documented to have both long and short‐styled flower morphs. The conservation status of this species is proposed as ‘Endangered' (EN), due to its restricted range and the presence of anthropogenic threats in the area.